Sandal midsole



FIG. 1 is a perspective view of my ornamental design of a sandal midsole.

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a front elevation view thereof; and,

FIG. 6 is a rear elevation view thereof.

The broken lines showing the sandal upper and the remainder of the sandal outsole are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sandal midsole, as shown and described. 